The present invention is directed to a reducible carton formed from a one-piece unitary blank of material. The reducible carton comprises a top wall, a bottom wall, opposite side walls, a front wall and a back wall. Means enabling the reducible carton to transversely separate it into a reusable rear carton component and a discardable front carton component. The reusable carton component comprises the back wall and a rear portion of each of the top wall, the bottom wall and the side walls, wherein the rear top wall portion, the rear bottom wall portion and the rear side wall portions in the reusable carton component each terminate in a forward edge defining an open forward end of the reusable carton component. The forward edge of one of the rear top wall portion or the rear bottom wall portion defines a seal flap that is foldable into closing relationship over the open forward end of the reusable carton component. The seal flap has a locking tab on a free edge thereof. The forward edge of the other of the rear top wall portion or the rear bottom wall portion includes a recess therein for frictionally receiving the locking tab to lock the seal flap in closed position.